What is the RMS voltage across a 50-ohm dummy load dissipating 1200 watts?

To find the RMS voltage when power and resistance are known, you can use the standard power formula P = E^2 / R, where P is power in watts, E is voltage in volts, and R is resistance in ohms. By rearranging this formula to solve for voltage, you get E = √(P × R). Plugging in the given values: E = √(1200 watts × 50 ohms) = √60,000. The square root of 60,000 is approximately 244.95 volts, which rounds neatly to 245 volts. Because dummy loads are purely resistive, there is no reactance to account for, making this straightforward application of Ohm's and Watt's laws perfectly accurate.